I'm not an expert on Naval strategy, but I suspect the movement and response of the US warship was a "testing of the waters' probing both the response and the capabilities of the Chinese. I think it accomplished the mission it went in there to do.
The news media is not posted for information they dont provide anything; we are just using it as point of conversation.
All we know US Ships are traveling through ‘new Chinese “ territorial waters
hence here we are.